Why a space rocket usually launched from west to east ? Why it is more advantageous to launch rockets in the equatorial plane ?

Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Why does a cloudily track from behind an aero plane flying at a great altitude?

Sumit somewhere heard about biopiracy. To know more about this, he discussed it with his uncle who was a professor of intellectual property rights. Uncle told him that it is the use of bioresources by multinational companies and other organisations without proper authorisation from the countries and people concerned and without any monetary or social advantage to the source country. Why is biopiracy considered unethical?

Iron may be protected from rusting by coating with zinc or tin. By referring to the data given below, explain why zinc protect iron more effectively than tin? Zn^(2+) + 2e^(-) rarr Zn, E^(@) = - 0.76 V Fe^(2+) + 2e^(-) rarr Fe, E^(@) = - 0.44V Sn^(2+) + 2e^(-) rarr Sn , E^(@) = - 0.14V